from decimal import Decimal

from django.db.models import Sum
from django.shortcuts import render
from django.views.generic import TemplateView

from shop.filters import ProductFilter
from shop.models import CartItem, Product, ProductPrice
from web.mixins import FilteredQuerysetMixin, PaginatedQuerysetMixin
from web.settings import ANONYMOUS_CART_ID_COOKIE_NAME
from web.utils import get_cart_total, get_or_create_cart


class ListProducts(TemplateView, FilteredQuerysetMixin, PaginatedQuerysetMixin):
    template_name = "web/list_products.html"
    queryset = Product.objects.all().prefetch_related(
        "images",
    )
    filter_class = ProductFilter

    def get_context_data(self, **kwargs):
        qs = self.get_queryset()
        page = self.get_paginated_queryset(qs)

        return {
            "page": page,
            "has_next_page": page.has_next(),
            "has_previous_page": page.has_previous(),
        }


def cart_dropdown(request, *args, **kwargs):
    cart, created = get_or_create_cart(request)

    response = render(
        request,
        "components/cart/cart_navbar.html",
        context={
            "cart": cart,
        },
    )

    if not request.user.is_authenticated:
        response.set_cookie(ANONYMOUS_CART_ID_COOKIE_NAME, cart.uuid)
    return response


def cart(request, *args, **kwargs):
    cart, created = get_or_create_cart(request)
    items = CartItem.objects.filter(cart=cart)

    base_total = Decimal("0.00")
    tax_total = Decimal("0.00")

    for item in items:
        price = ProductPrice.objects.filter(product=item.product, current=True).first()
        base_total += price.price * item.quantity
        tax_total += round(price.price * Decimal(price.tax.value / 100), 2)

    total = base_total + tax_total

    response = render(
        request,
        "components/cart/cart.html",
        context={
            "cart": cart,
            "items": items,
            "total": total,
            "base_total": base_total,
            "tax_total": tax_total,
        },
    )

    if not request.user.is_authenticated:
        response.set_cookie(ANONYMOUS_CART_ID_COOKIE_NAME, cart.uuid)
    return response


list_products = ListProducts.as_view()